/Engine/Source/Runtime/CoreUObject/Public/Misc/PackageName.h
Converts the supplied filename to long package name. Throws a fatal error if the conversion is not successful.
Long package name.
static [FString](API\Runtime\Core\Containers\FString) FilenameToLongPackageName ( const [FString](API\Runtime\Core\Containers\FString) & InFilename )